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Finite Population Correction Factor For Formulas 7-2 and 7-3 we assume that the population is infinite or very large and that we are sampling with replacement. When we sample without replacement from a relatively small population with size N, we modify E to include the finite population correction factor shown here, and we can solve for n to obtain the result given here. Use this result to repeat part (b) of Exercise 38, assuming that we limit our population to a county with 2500 women who have completed the time during which they can give birth.

E=z2p^q^nN-nN-1

n=Np^q^z22p^q^z22+N-1E2

Short Answer

Expert verified

The sample size required is equal to 1238.

Step by step solution

01

Given information

It is given that for a finite population of 2500 women, 82% of them give birth.

The confidence level is given to be equal to 99%, and the margin of error is equal to 0.02 (two percentage points).

02

Find the critical value

The level of significance is equal to 0.01.

The value of z2 from the standard normal distribution table is equal to 2.5758.

03

Determine the sample size

Use the given formula to compute the sample size:

n=Np^q^z22p^q^z22+N-1E2

Here,

p^ is the sample proportion of women who have given birth and is equal to 0.82.

q^ is the sample proportion of women who have not given birth.

N is the population size and is equal to 2500.

E is the margin of error is given to be equal to 0.02.

z2is equal to 2.5758.

Substitute all the values in the given formula as follows:

The formula for sample size,

n=Np^q^z22p^q^z22+N-1E2=25000.821-0.822.575820.821-0.822.57582+2500-10.0221238

Therefore, the sample size required is equal to 1238.

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